TPS659037: PMIC configuration in U-boot

Hi, 

I have a question regarding PMIC configuration.

In my system I am using AM5749 with TPS659037 Power management unit. When the system boots up U-BOOT starts by performing an early hardware initialization in which the PMIC is configured. This configuration changes the output voltage of the different regulators in order to supply the main SoC core power domains. The evaluation board uses these voltages to power other components of the system (eMMC for example). 

In U-BOOT the PMIC output voltage values are stored in a struct vcores data. A function “scale_vcores” is called to configure the PMIC using that structure. First it scales (usually down) to the fused values that are retrieved from the SoC.

On my custom board I use the PMIC to power my system with its default output voltages. Therefore I needed to make changes on U-BOOT to prevent it from configuring the different regulators of PMIC.

The way I do it is by defining a struct vcores data that has value fields zeroed as you can see below.

struct vcores_data custom_am574x_idk_volts = {

.mpu.value[OPP_NOM] = 0,

.mpu.efuse.reg[OPP_NOM] = STD_FUSE_OPP_VMIN_MPU_NOM,

.mpu.efuse.reg_bits = DRA752_EFUSE_REGBITS,

.mpu.addr = TPS659038_REG_ADDR_SMPS12,

.mpu.pmic = &tps659038,

.mpu.abb_tx_done_mask = OMAP_ABB_MPU_TXDONE_MASK,



.eve.value[OPP_NOM] = 0,

.eve.value[OPP_OD] = 0,

.eve.value[OPP_HIGH] = 0,

.eve.efuse.reg[OPP_NOM] = STD_FUSE_OPP_VMIN_DSPEVE_NOM,

.eve.efuse.reg[OPP_OD] = STD_FUSE_OPP_VMIN_DSPEVE_OD,

.eve.efuse.reg[OPP_HIGH] = STD_FUSE_OPP_VMIN_DSPEVE_HIGH,

.eve.efuse.reg_bits = DRA752_EFUSE_REGBITS,

.eve.addr = TPS659038_REG_ADDR_SMPS45,

.eve.pmic = &tps659038,

.eve.abb_tx_done_mask = OMAP_ABB_EVE_TXDONE_MASK,



.gpu.value[OPP_NOM] = 0,

.gpu.value[OPP_OD] = 0,

.gpu.value[OPP_HIGH] = 0,

.gpu.efuse.reg[OPP_NOM] = STD_FUSE_OPP_VMIN_GPU_NOM,

.gpu.efuse.reg[OPP_OD] = STD_FUSE_OPP_VMIN_GPU_OD,

.gpu.efuse.reg[OPP_HIGH] = STD_FUSE_OPP_VMIN_GPU_HIGH,

.gpu.efuse.reg_bits = DRA752_EFUSE_REGBITS,

.gpu.addr = TPS659038_REG_ADDR_SMPS6,

.gpu.pmic = &tps659038,

.gpu.abb_tx_done_mask = OMAP_ABB_GPU_TXDONE_MASK,



.core.value[OPP_NOM] = 0,

.core.efuse.reg[OPP_NOM] = STD_FUSE_OPP_VMIN_CORE_NOM,

.core.efuse.reg_bits = DRA752_EFUSE_REGBITS,

.core.addr = TPS659038_REG_ADDR_SMPS7,

.core.pmic = &tps659038,



.iva.value[OPP_NOM] = 0,

.iva.value[OPP_OD] = 0,

.iva.value[OPP_HIGH] = 0,

.iva.efuse.reg[OPP_NOM] = STD_FUSE_OPP_VMIN_IVA_NOM,

.iva.efuse.reg[OPP_OD] = STD_FUSE_OPP_VMIN_IVA_OD,

.iva.efuse.reg[OPP_HIGH] = STD_FUSE_OPP_VMIN_IVA_HIGH,

.iva.efuse.reg_bits = DRA752_EFUSE_REGBITS,

.iva.addr = TPS659038_REG_ADDR_SMPS8,

.iva.pmic = &tps659038,

.iva.abb_tx_done_mask = OMAP_ABB_IVA_TXDONE_MASK,

};

My questions : Is this the correct way to configure u-boot in order to keep the default output voltages of the PMIC ?

Thanks

David